LegalizeThe Water Supply (Water Quality) Regulations (Northern Ireland) 2007
Made: 8th March 2007
Coming into operation: 1st April 2007
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PART I — GENERAL
Citation and Commencement
1
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Interpretation
2
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PART II — WATER SUPPLY ZONES
Water Supply Zones
3
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PART III — WHOLESOMENESS
Wholesomeness
4
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PART IV — MONITORING OF WATER SUPPLIES
Interpretation and application of Part IV
5
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Monitoring: general provisions
6
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Sampling points
7
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Authorisation of supply points
8
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Number of samples
9
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Sampling: further provisions
10
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PART V — MONITORING – ADDITIONAL PROVISIONS
Interpretation of Part V
11
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Sampling for particular substances and parameters
12
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Sampling at treatment works
13
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Sampling at service reservoirs
14
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Sampling: new sources
15
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Collection and analysis of samples
16
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PART VI — INVESTIGATIONS, AUTHORISATION OF DEPARTURES AND REMEDIAL ACTION
Investigations: Schedule 1 parameters
17
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Investigations: indicator parameters
18
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Action by the Department
19
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Authorisation of temporary supply of water that is not wholesome
20
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Authorisations: terms and conditions
21
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Authorisations: other limitations
22
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Publicity for authorisations
23
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Revocation and modification of authorisations
24
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PART VII — WATER TREATMENT
Interpretation of Part VII
25
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Treatment of raw water
26
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Risk assessment for Cryptosporidium
27
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Procedure following risk assessment
28
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Contamination from pipes
29
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Application and introduction of substances and products
30
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Use of processes
31
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PART VIII — RECORDS AND INFORMATION
Maintenance of records
32
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Provision of information
33
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Publication of information
34
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PART IX — TRANSITIONAL PROVISIONS
Transitional Provisions
35
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SCHEDULE 1 — PRESCRIBED CONCENTRATIONS AND VALUES
| Item | Parameters | Concentration or Value (maximum) | Units of measurement | Point of Compliance[^f01000] |
|---|---|---|---|---|
| (*)Where water is supplied from a tanker see regulation 4(3)(a) | (*)Where water is supplied from a tanker see regulation 4(3)(a) | (*)Where water is supplied from a tanker see regulation 4(3)(a) | (*)Where water is supplied from a tanker see regulation 4(3)(a) | (*)Where water is supplied from a tanker see regulation 4(3)(a) |
| 1. | Enterococci | 0 | number/100ml | Consumers’ taps |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Consumers’ taps |
| Item | Parameters | Concentration or Value (maximum) | Units of measurement | Point of Compliance |
| --- | --- | --- | --- | --- |
| (**)Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). | (**)Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). | (**)Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). | (**)Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). | (**)Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). |
| 1. | Coliform bacteria | 0 | number/100ml | Service reservoirs[^f01001] and water treatment works |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Service reservoirs and water treatment works |
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| Notes:The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.See also regulation 6(6).See also regulation 4(2)(d).See the definition of “pesticides and related products” in regulation 2.The parametric value applies to each individual pesticide.“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | Notes:The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.See also regulation 6(6).See also regulation 4(2)(d).See the definition of “pesticides and related products” in regulation 2.The parametric value applies to each individual pesticide.“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | Notes:The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.See also regulation 6(6).See also regulation 4(2)(d).See the definition of “pesticides and related products” in regulation 2.The parametric value applies to each individual pesticide.“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | Notes:The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.See also regulation 6(6).See also regulation 4(2)(d).See the definition of “pesticides and related products” in regulation 2.The parametric value applies to each individual pesticide.“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | Notes:The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.See also regulation 6(6).See also regulation 4(2)(d).See the definition of “pesticides and related products” in regulation 2.The parametric value applies to each individual pesticide.“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| 1. | Acrylamide | 0.10 | µg/l | (i) |
| 2. | Antimony | 5.0 | µgSb/l | Consumers’ taps |
| 3. | Arsenic | 10 | µgAs/l | Consumers’ taps |
| 4 | Benzene | 1.0 | µg/l | Consumers’ taps |
| 5 | Benzo(a)pyrene | 0.010 | µg/l | Consumers’ taps |
| 6 | Boron | 1.0 | mgB/l | Consumers’ taps |
| 7 | Bromate | 10 | µgBrO₃/l | Consumers’ taps |
| 8 | Cadmium | 5.0 | µgCd/l | Consumers’ taps |
| 9 | Chromium | 50 | µgCr/l | Consumers’ taps |
| 10 | Copper (ii) | 2.0 | mgCu/l | Consumers’ taps |
| 11 | Cyanide | 50 | µgCN/l | Consumers’ taps |
| 12 | 1, 2 dichloroethane | 3.0 | µg/l | Consumers’ taps |
| 13 | Epichlorohydrin | 0.10 | µg/l | (i) |
| 14 | Fluoride | 1.5 | mgF/l | Consumers’ taps |
| 15 | Lead (ii) | (a) 25, from 25th December 2003 until immediately before 25th December 2013 | µgPb/l | Consumers’ taps |
| (b) 10, on and after 25th December 2013 | µgPb/l | Consumers’ taps | ||
| 16 | Mercury | 1.0 | µgHg/l | Consumers’ taps |
| 17 | Nickel (ii) | 20 | µgNi/l | Consumers’ taps |
| 18 | Nitrate (iii) | 50 | mgNO₃/l | Consumers’ taps |
| 19 | Nitrite (iii) | 0.50 | mgNO₂/l | Consumers’ taps |
| 0.10 | Treatment works | |||
| 20 | Pesticides (iv) (v)AldrinDieldrinHeptachlorHeptachlor epoxide | 0.030 | µg/l | Consumers’ taps |
| other pesticides | 0.10 | µg/l | Consumers’ taps | |
| 21 | Pesticides: Total (vi) | 0.50 | µg/l | Consumers’ taps |
| 22 | Polycyclic aromatic hydrocarbons (vii) | 0.10 | µg/l | Consumers’ taps |
| 23 | Selenium | 10 | µgSe/l | Consumers’ taps |
| 24 | Tetrachloroethene and Trichloroethene (viii) | 10 | µg/l | Consumers’ taps |
| 25 | Trihalomethanes: Total (ix) | 100 | µg/l | Consumers’ taps |
| 26 | Vinyl chloride | 0.50 | µg/l | (i) |
| Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| 1. | Aluminium | 200 | µgAl/l | Consumers’ taps |
| 2. | Colour | 20 | mg/l Pt/Co | Consumers’ taps |
| 3. | Hydrogen ion | 10.0 | pH value | Consumers’ taps |
| 6.5 (minimum) | pH value | |||
| 4. | Iron | 200 | µgFe/l | Consumers’ taps |
| 5. | Manganese | 50 | µgMn/l | Consumers’ taps |
| 6. | Odour | 3 at 25°C | Dilution number | Consumers’ taps |
| 7. | Sodium | 200 | mgNa/l | Consumers’ taps |
| 8. | Taste | 3 at 25°C | Dilution number | Consumers’ taps |
| 9. | Tetrachloromethane | 3 | µg/l | Consumers’ taps |
| 10. | Turbidity | 4 | NTU | Consumers’ taps |
| Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| 1. | Aluminium | 200 | µgAl/l | Consumers’ taps |
| 2. | Colour | 20 | mg/l Pt/Co | Consumers’ taps |
| 3. | Hydrogen ion | 10.0 | pH value | Consumers’ taps |
| 6.5 (minimum) | pH value | |||
| 4. | Iron | 200 | µgFe/l | Consumers’ taps |
| 5. | Manganese | 50 | µgMn/l | Consumers’ taps |
| 6. | Odour | 3 at 25°C | Dilution number | Consumers’ taps |
| 7. | Sodium | 200 | mgNa/l | Consumers’ taps |
| 8. | Taste | 3 at 25°C | Dilution number | Consumers’ taps |
| 9. | Tetrachloromethane | 3 | µg/l | Consumers’ taps |
| 10. | Turbidity | 4 | NTU | Consumers’ taps |
SCHEDULE 2 — Table in Schedule 2 of the Water Supply (Water Quality) Regulations (Northern Ireland) 2007 (indicator parameters)
| Item | Parameters | Specification concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of Monitoring |
|---|---|---|---|---|
| (*)May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | (*)May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | (*)May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | (*)May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | (*)May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. |
| (i)The water should not be aggressive. | (i)The water should not be aggressive. | (i)The water should not be aggressive. | (i)The water should not be aggressive. | (i)The water should not be aggressive. |
| (ii)Where radon concentrations exceed 1000Bq/l, remedial action shall be carried out on radiological protection grounds without further consideration. | (ii)Where radon concentrations exceed 1000Bq/l, remedial action shall be carried out on radiological protection grounds without further consideration. | (ii)Where radon concentrations exceed 1000Bq/l, remedial action shall be carried out on radiological protection grounds without further consideration. | (ii)Where radon concentrations exceed 1000Bq/l, remedial action shall be carried out on radiological protection grounds without further consideration. | (ii)Where radon concentrations exceed 1000Bq/l, remedial action shall be carried out on radiological protection grounds without further consideration. |
| (iii)Excluding tritium, potassium-40, radon, and radon decay products. | (iii)Excluding tritium, potassium-40, radon, and radon decay products. | (iii)Excluding tritium, potassium-40, radon, and radon decay products. | (iii)Excluding tritium, potassium-40, radon, and radon decay products. | (iii)Excluding tritium, potassium-40, radon, and radon decay products. |
| (iv)Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides shall be required. | (iv)Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides shall be required. | (iv)Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides shall be required. | (iv)Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides shall be required. | (iv)Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides shall be required. |
| (v)Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | (v)Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | (v)Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | (v)Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | (v)Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. |
| (vi)If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | (vi)If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | (vi)If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | (vi)If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | (vi)If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. |
| 1 | Ammonium | 0.50 | mgNH₄/l | Consumers’ taps |
| 2 | Chloride[^f01001] | 250 | mgCl/l | Supply point[^f01000] |
| 3 | Clostridium Perfringens (including spores) | 0 | Number/100ml | Supply point[^f01000] |
| 4 | Coliform bacteria | 0 | Number/100ml | Consumers’ taps |
| 5 | Colony counts | No abnormal change | Number/1ml at 22oCNumber/1ml at 37oC | Consumers’ taps, service reservoirs and treatment works |
| 6 | Conductivity[^f01001] | 2500 | µS/cm at 20 oC | Supply point[^f01000] |
| 7 | Hydrogen ion[^f01001] | 9.56.5 (minimum) | pH value | Consumers’ taps |
| 8 | Radon (for radioactivity)[^f01002][^f01005] | 100 | Bq/l | Supply point[^f01000] |
| 9 | Sulphate [^f01001] | 250 | mgSO₄/l | Supply point[^f01000] |
| 10 | Indicative dose (for radioactivity)[^f01003][^f01005][^f01006] | 0.10 | mSv | Supply point[^f01000] |
| 11 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point[^f01000] |
| 12 | Tritium (for radioactivity)[^f01004][^f01005] | 100 | Bq/l | Supply point[^f01000] |
| 13 | Turbidity | 1 | NTU | Treatment works |
SCHEDULE 3 — Tables 1-3 in Schedule 3 of the Water Supply (Water Quality) Regulations (Northern Ireland) 2007
| Item | Parameter | Circumstances |
|---|---|---|
| 1 | Aluminium | When used as a flocculant or where the water originates from, or is influenced by, surface waters. |
| 2 | Ammonium | |
| 3 | Clostridium pefringens (including spores) | Where the water originates from, or is influenced by, surface waters. |
| 4 | Coliform bacteria | |
| 5 | Colony Counts | |
| 6 | Colour | |
| 7 | Conductivity | |
| 8 | Escherichia coli (E.coli) | |
| 9 | Hydrogen ion | |
| 10 | Indicative Dose | Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken. |
| 11 | Iron | When used as a flocculant or where the water originates from, or is influenced by, surface waters. |
| 12 | Manganese | Where the water originates from, or is influenced by, surface waters. |
| 13 | Nitrate | When chloramination is practised |
| 14 | Nitrite | When chloramination is practised |
| 15 | Odour | |
| 16 | Radon | Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken. |
| 17 | Taste | |
| 18 | Tritium | Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken. |
| 19 | Turbidity | |
| (1)Substances and parameters subject to monitoring | (2)Estimated population of water supply zone | (3)Reduced |
| --- | --- | --- |
| (*)Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and below (iii) below. | (*)Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and below (iii) below. | (*)Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and below (iii) below. |
| (i)Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. | (i)Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. | (i)Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. |
| (ii)Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. | (ii)Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. | (ii)Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. |
| (iii)Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. | (iii)Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. | (iii)Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. |
| (iv)To monitor for indicative dose (for radioactivity). | (iv)To monitor for indicative dose (for radioactivity). | (iv)To monitor for indicative dose (for radioactivity). |
| (v)In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | (v)In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | (v)In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. |
| Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. | Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. | Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. |
| Subject to check monitoring | Subject to check monitoring | Subject to check monitoring |
| E.coli | <100 | |
| Coliform bacteria | ≥100 | |
| Residual disinfectant | ||
| Aluminium | <100 | 1 |
| Ammonium | 100-4,999 | 2 |
| Clostridium perfringens(including spores)[^f01007] | 5,000-9,999 | 6 |
| Colony Counts | 10,000-29,999 | 12 |
| Colour | 30,000-49,999 | 18 |
| Conductivity[^f01007] | 50,000-79,999 | 26 |
| Hydrogen ion | 80,000-100,000 | 38 |
| Iron | ||
| Manganese | ||
| Nitrate[^f01009] | ||
| Nitrite[^f01009] | ||
| Odour | ||
| Taste | ||
| Turbidity | ||
| Subject to audit monitoring | Subject to audit monitoring | Subject to audit monitoring |
| Aluminium | <100 | |
| Antimony | 100-4,999 | |
| Arsenic | 5,000-100,000 | |
| Benzene[^f01007] | ||
| Benzo(a)pyrene | ||
| Boron[^f01007] | ||
| Bromate[^f01010] | ||
| Cadmium | ||
| Chromium | ||
| Clostridium perfringens(including spores) | ||
| Copper | ||
| Cyanide[^f01007] | ||
| 1,2, dichloroethane[^f01007] | ||
| Enterococci | ||
| Fluoride[^f01007] | ||
| Gross Alpha[^f01007][^f01011][^f01012] | ||
| Gross Beta[^f01007][^f01011][^f01012] | ||
| Iron | ||
| Lead | ||
| Manganese | ||
| Mercury[^f01007] | ||
| Nickel | ||
| Nitrate[^f01009] | ||
| Nitrite[^f01009] | ||
| Pesticides and related products[^f01007] | ||
| Polycyclic aromatic hydrocarbons | ||
| Radon[^f01007] | ||
| Selenium | ||
| Sodium | ||
| Trichloroethene/ Tetrachloroethene[^f01007] | ||
| Tetrachloromethane[^f01007] | ||
| Trihalomethanes | ||
| Chloride[^f01007] | ||
| Sulphate[^f01007] | ||
| Total Organic carbon[^f01007] | ||
| Tritium[^f01007] | ||
| (1)Item | (2)Substances and parameters | (3) Volume of water supplied m3/d |
| --- | --- | --- |
| (i)Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3) | (i)Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3) | (i)Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3) |
| (ii)Sampling at treatment works when chloramination is practised. | (ii)Sampling at treatment works when chloramination is practised. | (ii)Sampling at treatment works when chloramination is practised. |
| (iia)Sampling at treatment works when chloramination is not practised. | (iia)Sampling at treatment works when chloramination is not practised. | (iia)Sampling at treatment works when chloramination is not practised. |
| (iii)Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iii)Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iii)Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. |
| (iv)To monitor for indicative dose (for radioactivity). | (iv)To monitor for indicative dose (for radioactivity). | (iv)To monitor for indicative dose (for radioactivity). |
| Note 1: Sampling is at treatment works for the substances and parameters shown in column (1) of Table 3 as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to footnotes (ii) and (ii)(a) to the Table below. | Note 1: Sampling is at treatment works for the substances and parameters shown in column (1) of Table 3 as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to footnotes (ii) and (ii)(a) to the Table below. | Note 1: Sampling is at treatment works for the substances and parameters shown in column (1) of Table 3 as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to footnotes (ii) and (ii)(a) to the Table below. |
| Note 2: Table 3 sets out the annual sampling frequencies for all of the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. | Note 2: Table 3 sets out the annual sampling frequencies for all of the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. | Note 2: Table 3 sets out the annual sampling frequencies for all of the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken. |
| 1 | E.coli | <20 |
| 2 | Coliform bacteria | 20-1,999 |
| 3 | Colony counts | 2,000-5,999 |
| 4 | Nitrite[^f01014] | 6,000-11,999 |
| 5 | Residual disinfectant | ≥ 12,000 |
| 6 | Turbidity | |
| Subject to check monitoring | Subject to check monitoring | Subject to check monitoring |
| 7 | Clostridium perfringens[^f01013] | <20 |
| 8 | Conductivity | 20-999 |
| 1,000-1,999 | ||
| 2,000-5,999 | ||
| 6,000-9,999 | ||
| 10,000-15,999 | ||
| 16,000-32,999 | ||
| 33,000-49,999 | ||
| 50,000-67,999 | ||
| 68,000-84,999 | ||
| 85,000-101,999 | ||
| 102,000-119,999 | ||
| 120,000-241,999 | ||
| 242,000-484,999 | ||
| 485,000-728,999 | ||
| 8A | Indicative Dose (for radioactivity) | <20 |
| 8B | Gross alpha[^f01017] | 20-999 |
| 8C | Gross beta[^f01017] | 1,000-49,999 |
| 8D | Radon | 50,000-89,999 |
| 8E | Tritium | 90,000-299,999 |
| 300,000-649,999 | ||
| ≥ 650,000 | ||
| Subject to audit monitoring | Subject to audit monitoring | Subject to audit monitoring |
| 9 | Benzene | <20 |
| 10 | Boron | 20-999 |
| 11 | Bromate[^f01016] | 1,000-49,999 |
| 11A | Clostridium perfringens (including spores) | 50,000-89,999 |
| 12 | Cyanide | 90,000-299,999 |
| 13 | 1,2,dichloroethane | 300,000-649,999 |
| 14 | Fluoride | ≥ 650,000 |
| 15 | Mercury | |
| 16 | Nitrite[^f01015] | |
| 17 | Pesticides and related products | |
| 18 | Trichloroethene/Tetrachloroethene | |
| 19 | Tetrachloromethane | |
| 20 | Chloride | |
| 21 | Sulphate | |
| 22 | Total Organic Carbon | |
| 22a | Radon | |
| 23 | Tritium | |
| 24 | Indicative Dose (for radioactivity) | |
| 25 | Gross alpha[^f01017] | |
| 26 | Gross beta[^f01017] |
SCHEDULE 4 — ANALYTICAL METHODOLOGY
| (1) | (2) |
|---|---|
| Parameter | Method |
| Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds. |
| Coliform bacteria | ISO 9308-1 |
| Colony count 22°C-enumeration of culturable microorganisms | PrEN ISO 6222 |
| Colony count 37°C-enumeration of culturable microoganisms | prEN ISO 6222 |
| Enterococci | ISO 7899-2 |
| Escherichia coli (E. coli) | ISO 9308-1 |
| *The composition of m-CP agar is: | |
| Basal medium | |
| Tryptose | 30.0g |
| Yeast extract | 20.0g |
| Sucrose | 5.0g |
| L-cysteine hydrochloride | 1.0g |
| MgSO₄.7H₂O | 0.1g |
| Bromocresol purple | 40.0mg |
| Agar | 15.0g |
| Water | 1,000.0ml |
| Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add: | |
| D-cycloserine | 400.0mg |
| Polymyxine-B sulphate | 25.0mg |
| Indoxyl-[beta]-D-glucoside | 60.0mg |
| to be dissolved in 8ml sterile water before addition | |
| Filter-sterilised 0.5% phenolphthalein diphosphate solution | 20.0ml |
| Filter-sterilised 4.5% FeCl₃.6H₂O | 2.0ml |
| (1) | (2) |
| --- | --- |
| Parameters | Trueness % of prescribed concentration or value or specification |
| Notes:The method of analysis should determine total cyanide in all forms.The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.The performance characteristics apply to the prescribed value of 4 NTU.The performance characteristics apply to the specification of 1 NTU for water leaving treatment works. | Notes:The method of analysis should determine total cyanide in all forms.The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.The performance characteristics apply to the prescribed value of 4 NTU.The performance characteristics apply to the specification of 1 NTU for water leaving treatment works. |
| Aluminium | 10 |
| Ammonium | 10 |
| Antimony | 25 |
| Arsenic | 10 |
| Benzene | 25 |
| Benzo(a)pyrene | 25 |
| Boron | 10 |
| Bromate | 25 |
| Cadmium | 10 |
| Chloride | 10 |
| Chromium | 10 |
| Colour | 10 |
| Conductivity | 10 |
| Copper | 10 |
| Cyanide (i) | 10 |
| 1,2-dichloroethane | 25 |
| Fluoride | 10 |
| Iron | 10 |
| Lead | 10 |
| Manganese | 10 |
| Mercury | 20 |
| Nickel | 10 |
| Nitrate | 10 |
| Nitrite | 10 |
| Pesticides and related products (ii) | 25 |
| Polycyclic aromatic hydrocarbons (iii) | 25 |
| Selenium | 10 |
| Sodium | 10 |
| Sulphate | 10 |
| Tetrachloroethene (iv) | 25 |
| Tetrachloromethane | 20 |
| Trichloroethene (iv) | 25 |
| Trihalomethanes: | 25 |
| Total (iii) | |
| Turbidity (v) | 10 |
| Turbidity (vi) | 25 |
Signed
Sealed with the Official Seal of the Department for Regional Development on 8th March 2007
John Mills — A senior officer of the — Department for Regional Development
Explanatory note
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Footnotes
[^f00001]: S.I. No. 3336 (N.I. 21)
[^f00002]: S.I. 1998/2793
[^f00003]: 1972 c.68
[^f00004]: S.I 1972/1265 (N.I. 14)
[^f00005]: O.J. L330, 5.12.98, p. 32
[^f00006]: O.J. No. L194, 16.6.75, p. 26
[^f00007]: S.I. 1999/662 (N.I. 6)
[^f00008]: S.R. 1996 No. 603
[^f00009]: O.J. No. L40, 11.2.89, p. 12
[^f00010]: Cmnd 2073
[^f00011]: Cmnd 2183
[^f00012]: S.I. 2000/3184
[^f00013]: O.J. No. L204, 21.7.98, p. 37, amended by Council Directives 98/48/EC (O.J. No. 217, 5.8.98, p. 18)
Editorial notes
Schedule 5 Monitoring for indicative dose and analytical performance characteristics.
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